Re: Lab values with a decimal
Re: Lab values with a decimal
- Subject: Re: Lab values with a decimal
- From: Thomas Richard <email@hidden>
- Date: Mon, 09 Apr 2018 12:37:08 +0200
Hello Scott,
> > So examine say ProPhoto RGB where we have 0R/G255/B0 in LR vs. Photoshop.
> > LR indicates this isn't a 'legal' value where Photoshop just truncates it.
> > I find that useful.
>
>Help me understand this - what do you mean by LR indicates this isn't a legal
>value? Are we talking about a color that falls *outside* of ProPhoto
>0R/G255/B0?
No, we are talking about colors that aren't colors, since they are out of the
visible range.
Every ProPhoto triplet with 0 for red and green and any amount of blue leads to
a L* of 0. So Prophoto blue is a lightless color.
Same thing for greens: up from 0/135/0 to 0/255/0 the a* is -128.
Values of 136G an above are imaginary colors.
For that reason, calculating colors in Prophoto RGB is a nogo in my opinion.
MfG
Thomas Richard
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